L6285 Ver la hoja de datos (PDF) - STMicroelectronics
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L6285 Datasheet PDF : 16 Pages
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L6285
BLOCK DIAGRAM DESCRIPTION
(see Block Diagram)
Inside the I.C. there are two unipolar stepper mo-
tor drivers, one bridge driver for DC motor, 4x4 bit
latch registers, one shift register. the input logic,
the charge pump, and the thermal protection.
The following conditions are valid for all the 3
driver sections:
1)When the osc/res pin is tied to GND, an inter-
nal reset signal is generated which switches
off all the outputs and resets the internal reg-
isters.
2)The conditions 1 is valid also during power on
and power off transitions.
3)During power on and power off, the I.C. is
safe for any conditions of VS and Vp
3)If Vp is present and VS desappears, the out-
puts are switched off.
Input Logic
The input CMOS logic interfaces the microproces-
sor logic to the 4 registers. An integrated Schmitt-
trigger circuit is used to improve noise immunity
at each logic input.
The data is introduced in the 16bit shift register by
the SID pin. The first bit b 15 after 16 clock ap-
plied to SCK pin will be the D15 of the shift regis-
ter.
On the falling edge of STB the 16 bits of the shift
register are transferred to the outputs of the 4
latch registers. Fig 2 shows the timing.
CHA and CHB Stepper Motor Drivers
Registers
The Combo Motor Driver controls the 3 channels using 4 latch registers of 4 bit each:
D0
REGISTER 1
D1
D2
D3
D0
REGISTER 2
D1
D2
D3
D0
REGISTER 3
D1
D2
D3
D0
REGISTER 4
D1
D2
D3
=
PHASE 1A
=
NPHASE 2A
=
PHASE 3A
=
NPHASE 4A
=
PHASE 1B
=
NPHASE2B
=
PHASE 3B
=
NPHASE4B
=
D/A CHANNEL A
=
D/A CHANNEL A
=
D/A CHANNEL B
=
D/A CHANNEL B
=
INPUT 1
=
INPUT 2
=
V2 VOLTAGE
=
V2 VOLTAGE
CHANNEL A
CHANNEL A
CHANNEL A
CHANNEL A
CHANNEL B
CHANNEL B
CHANNEL B
CHANNEL B
LEAST
MOST
LEAST
MOST
CHANNEL C
CHANNEL C
CHANNEL C
CHANNEL C
Register 1/2 Output Status (CHA and CHB) . See note 1
D0
D1
D2
D3
OUT1 A/B
0
0
0
0
OFF
1
0
0
0
ON
1
0
1
0
ON
0
0
1
0
OFF
0
1
1
0
OFF
0
1
0
0
OFF
0
1
0
1
OFF
0
0
0
1
OFF
1
0
0
1
ON
ALL THE OTHERS
OF F
OUT2 A/B
OF F
OF F
OF F
OF F
ON
ON
ON
OF F
OF F
OF F
OUT3 A/B
OF F
OF F
ON
ON
ON
OF F
OF F
OF F
OF F
OF F
OUT4 A/B
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
Register 3 Current Reference (D/A OUTPUT)
DO
D1 REFER. VOLTAGE CHANNEL A
0
0
0
1
1
0
1
1
0.125 V
0.250 V
0.375 V
0.500 V
6/16
D2
D3 REFER. VOLTAGE CHANNEL B
0
0
0
1
1
0
1
1
0.125 V
0.250 V
0.375 V
0.500 V
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